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I experienced a similar prob on my 86. I had recently rebuilt the head and removed the coolant temperature sensor and not installed the wire plug into it properly. I discovered the issue after a week of swearing and foot stomping and lots of tests with an ohm meter at the ECU. What was happening was that the sensor was telling the ECU that the outside temp was somewhere south of -40 degrees F. consiquently cold start was fine, but hot start initiated the "cold start injector" which flooded the engine.
The sensor screws into the head and protrudes into the water jacket. it is located under the intake manifold and can be a bit tricky to remove to test, but it can be done with the intake manifold still in place. I would jiggle the wire and plug and see if you have a similar problem. if that doesn't fix it, you can do 2 things. 1- buy a chiltons book and test the Ohm readout at the ECU....the sensor is a thermo resistor and as temp increases resistence decreases. the chiltons will tell you which ports to test at at the ecu and will give you a line graph to follow to correspond temp and ohms. option 2 remove the sensor and test it at room temp...note the ohm readout....warm the sensor and note the readout again....as previously stated resistance should drop. I would venture to guess that when the sensors go, that it is a compelete loss and that they don't simply read incorrectly (just a guess). I hope this helps and i would def test rather than replace as i rember the sensor is $40 or so....again i am not sure. Oh a third possible prob....wire short between the sensor and the ECU...simply check the Ohm readout at either end...it should read at or near 0 (depending on how sensitive your meter is).......good luck
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